Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Poster II - Atomic clusters

A 22.9: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster B

Optimizing the interaction of silver clusters with intense laser fields — •nguyen xuan truong, tilo döppner, jan müller, andreas przystawik, and karl heinz meiwes-broer — Universität Rostock, Fachbereich Physik, Universitätsplatz 3, 18051 Rostock

Silver clusters are generated by pick-up into helium droplets and exposed to intense fs laser fields. The charging processes of the metal kernel are most efficient when a resonance between the laser frequency and the collective excitation has been established. It has been shown in dual-pulse and focus-scan experiments [1,2] that the dynamics of the process depends on the optical delay and the chosen laser intensity. A self-learning technique is introduced in order to optimize the signal of the highly charged atomic fragments by changing simultaneously the pulse duration, the dual-pulse delay, and the lens position. For 2.5mJ laser pulses the maximum signal of Ag^+q (with q= 14,16,17) is obtained for a delay of 240fs and a lens position of 6mm.

[1] T. Döppner et al., Phys. Rev. Lett. 94, 013401 (2005).

[2] T. Döppner et al., Eur. Phys. J. D, submitted.